ADJUSTMENTS PRIOR TO MACHINE START 17.5 ADJUSTING THE HEATING AND VENTILATION SYSTEM 17.5.1 ADJUSTING THE VENTILATION SYSTEM When the ventilation system is operated, air is blown into the driver's cab. If the cabin is closed, a light overpressure is built up, preventing dust from outside to settle down in the cab. To in- crease the volume of filtered fresh air, you can open the ventila- tion grid a little. 75_153 The air is distributed via the air ventilation nozzles (1 and 2) on the left-hand and right-hand side of the steering column. You may open or close the nozzles individually. The exhaust direc- tion can be varied using the diffusing disks.
You can direct the air ventilation nozzles (1) onto the front windshield and the air venti- lation nozzles (2) onto the side windows. 1 2 75_293 You may realize a comfortable temperature, if you open all air ventilation nozzles, set the temperature rotary switch to a com- fortable temperature and set the fan to an appropriately low air throughput. To cool down the temperature inside the cabin, open all air venti- lation nozzles, set the temperature rotary switch to position 'Cold' and set the fan to its highest level. To prevent premature tiredness due to lack of oxygen, it is rec- ommended to open the door a little from time to time and to lock it in this position.
Optionally, you may leave open the ventilation grid above the side window. 79 75 158 _ 75 1 75 0